Fix `disable_attention_slicing` in pipelines (#498)

Fix `disable_attention_slicing` in pipelines.

src/diffusers/pipelines/stable_diffusion/pipeline_stable_diffusion_img2img.py

@@ -99,7 +99,7 @@ class StableDiffusionImg2ImgPipeline(DiffusionPipeline):
         back to computing attention in one step.
         """
         # set slice_size = `None` to disable `set_attention_slice`
-        self.enable_attention_slice(None)
+        self.enable_attention_slicing(None)
 
     @torch.no_grad()
     def __call__(

src/diffusers/pipelines/stable_diffusion/pipeline_stable_diffusion_inpaint.py

@@ -118,7 +118,7 @@ class StableDiffusionInpaintPipeline(DiffusionPipeline):
         back to computing attention in one step.
         """
         # set slice_size = `None` to disable `set_attention_slice`
-        self.enable_attention_slice(None)
+        self.enable_attention_slicing(None)
 
     @torch.no_grad()
     def __call__(